DETOXIFICATION TREATMENT OF INCINERATION ASH OR FLY ASH

摘要

PROBLEM TO BE SOLVED: To remove heavy metals from incineration ash or fly ash and to suppress the elution of the residual heavy metals. ;SOLUTION: Incineration ash or fly ash is supplied to a vacuum heating furnace 2 to introduce the exhaust gas of an incinerator 3 into the vacuum heating furnace from a branch passage 6 to convert various compds. of heavy metals to chlorides. A first volatile component G1 is discharged from a suction pipe 2B by raising the temp. in the vacuum heating oven 2 to 600-below 850°C to collect chlorides of heavy metals. Continuously, by raising the temp. in the heating furnace 2 to 850-1,200°C, alkali metal chlorides are collected. The residue in the vacuum heating furnace 2 is added to a sulfurous compd. S of a waste tire or the like and subsequently allowed to stand while heated by the remaining heat in the heating furnace 2 and chlorides of heavy metals or alkali metal chlorides not removed by volatilization are converted to sulfur compds.;COPYRIGHT: (C)1999,JPO